AZL-47555
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-47555.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-47555
- Upstream
- Published
- 2024-07-29T16:15:04Z
- Modified
- 2026-04-01T05:17:03.649476Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- CVE-2024-41096 affecting package kernel for versions less than 6.6.43.1-7
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
PCI/MSI: Fix UAF in msicapabilityinit
KFENCE reports the following UAF:
BUG: KFENCE: use-after-free read in _pcienablemsirange+0x2c0/0x488
Use-after-free read at 0x0000000024629571 (in kfence-#12): __pcienablemsirange+0x2c0/0x488 pciallocirqvectorsaffinity+0xec/0x14c pciallocirqvectors+0x18/0x28
kfence-#12: 0x0000000008614900-0x00000000e06c228d, size=104, cache=kmalloc-128
allocated by task 81 on cpu 7 at 10.808142s: __kmemcachealloc_node+0x1f0/0x2bc kmalloctrace+0x44/0x138 msiallocdesc+0x3c/0x9c msidomaininsertmsidesc+0x30/0x78 msisetupmsidesc+0x13c/0x184 __pcienablemsirange+0x258/0x488 pciallocirqvectorsaffinity+0xec/0x14c pciallocirqvectors+0x18/0x28
freed by task 81 on cpu 7 at 10.811436s: msidomainfreedescs+0xd4/0x10c msidomainfreelocked.part.0+0xc0/0x1d8 msidomainallocirqsalllocked+0xb4/0xbc pcimsisetupmsi_irqs+0x30/0x4c __pcienablemsirange+0x2a8/0x488 pciallocirqvectorsaffinity+0xec/0x14c pciallocirqvectors+0x18/0x28
Descriptor allocation done in: _pcienablemsirange msicapabilityinit msisetupmsidesc msiinsertmsidesc msidomaininsertmsidesc msiallocdesc ...
Freed in case of failure in __msidomainalloc_locked() __pcienablemsi_range msicapabilityinit pcimsisetupmsiirqs msidomainallocirqsalllocked msidomainalloclocked __msidomainalloclocked => fails msidomainfreelocked ...
That failure propagates back to pcimsisetupmsiirqs() in msicapabilityinit() which accesses the descriptor for unmasking in the error exit path.
Cure it by copying the descriptor and using the copy for the error exit path unmask operation.
[ tglx: Massaged change log ]
- References